Rivet-head trimmer.



M. .l. HEALY.

RIVET HEAD TRIMMER.

APPLICATION FlLED JAN-4. 1915.

Patented Nov. 16, 1915.

mms.

APH CO., WASHINGTON, D. c.

nriirnn STATES PATENT @FFEQE.

MICHAEL J. HEALY, OFCHICAGO,"ILLINOIS, ASSIGNOR 0F ONE-HALF 'IO GAESARCD AL PING, OF CHICAGO, ILLINOIS.

B-IVET-HEAD 'rnrirrann.

Specification of Letters Patent.

Patented Nov. 1%,1915.

Application filed January 4, 1915. Serial No. 402.

To all an/"tom it may concern.

Be it known that 1, MICHAEL J. HEALY, a citizen of the United States, and a resident of the city of Chicago, county of Cook, and tate of Illinois, have invented certain new and useful Improvements in Rivet-Head Trimmers, of which the following is a speci-' fication.

My invention relates to improvements in cutting devices adapted for use in thetrimming down of the heads of rivets so as to permit of ready removal of the latter.

The object of my invention is the production of a tool of this class which willube portable in character, and which will be of durable and economical construction and eflicient in use.v

Other objects will appear hereinafter.

The invention consists in the combinations and arrangements of parts hereinafter described and. claimed.

The invention will be best understood by reference to the accompanying drawing forming a part of this specification, and in which, Figure l isa side elevation of a device embodying my invention, Fig. 2 is a central section of the device showing the cutting elements thereof in outward position, Fig. 8 is a view similar to Fig. 2, showing the cutting elements of the device in ins ward position, and Fig. 4: is a bottom plan view of Fig. 1.

The preferred form of construction, as illustrated in the drawings comprises a tapering shank 1 formed at its lower end with a head or enlargement 2 of frustoconical or correspondingly tapering formation. Formed in the periphery of the head 2 is a plurality of equally spaced elongated radial slots 3, each of which opens in one side and one end of said head, as clearly shown in the several views.

Provided adjacent the upper closed end of each of the slots 3 is a transversely extending pin 4, the ends of which are securely held by embedding in said head. Arranged in each of the slots 3 is an elonated cutting element 5, the upper end of which pivotally engages with the corresponding pin 4. Said end of said cutting element is provided with a laterally opening slot 6 which permits of ready detachment of the cutting element when the latter is rocked to horizontal position, or to a position at substantially right angles to the axis of the shank 1. The construction is such, however, that said cutting elements w1ll be locked to the head 2 when the same are 111 depending or operative position, as shown in the several views. The lower or free end of each cutting element 5 is cut away at 1ts inner side to form a cutting edge 7 The detachable connection of said cutting elements with the head 2, just referred to, 1s of special advantage in that it permits of ready detachment of the blades for sharpening of the same, as will be readily understood.

Provided at the upper end of the head 2 1S a longitudinally shiftable sleeve 8 of a form corresponding with that of said head, the same being adapted, when moved down wardly or toward the cutting elements 5, to rock the same inwardly, as clearly shown in Fig. 3. Such shifting of the sleeve 8 is effected by means of a collar 9 provided with internal threads which engage with left hand threads 10 which are provided at the cylindrically formed base of shank 1. At the under side of member 9 is provided a retainer ring 11 detachably secured in po sition by screws 12. The retainer ring 11 is formed for engagement with an inwardly projecting annular flange 13 formed at the upper end of sleeve 8, the arrangement being such, as will be seen, that said sleeve will be locked to the member 9 against longitudinal movement relative thereto, but in such a manner as to permit of free relative rotary movement of said sleeve.

Provided at one side of the member 9 is an outwardly projecting finger piece 14: which affords means for manually arresting rotary movement of the member 9 during rotation of the shank 1. Vith this arrangement, it will be seen, that in use, or during rotation of the device, when it is desired to rock the cutting elements 5 inwardly, it is only necessary to engage the finger piece 14 in order to arrest movement of the member 9. hen this is done, the continued rotation of the shank 1 will cause the member 9 and hence the sleeve 8 to be moved downwardly with the result of carrying said sleeve into engagement with the outer edges of cutting elements 5, so as to the position shown in Fig. 8. By reason of the connection between the member 9 and the sleeve 8 which permits of free relative rotary movement of the latter, upon said to rock the same inwardly engagement with the rivet head, as clearly shown in Fig. 2. v r

' With the construction set forth, when it is desired to trim down a rivet head, to the diameter of the shank of the rivet in order to permit of ready removal of the latter from the work in which the same is seg cured, it IS only necessary, after connecting the tool with a. flexible driving shaft,

- cutting edges i of the cutting members 0 thereof in contact with the rivet head, as

to place the outer end of the tool with the shown in Fig. 2. This having been done, upon rotation of the tool and upon arrests ing rotation of member 9,. the sleeve 8 will be moved toward, the cutting elements 5 and cause the free ends thereof to be rocked inwardly so as to gradually trim down the rivet head, as shown in Fig. 3. With the head at one end of the rivet trimmed down to the diameter of the shaft thereof, it is apparent thatthe rivet may be readily driven out and thus removed.

While I have illustrated and described the preferred form of construction for carrying my invention into efiect, this is capable of variation and modification without departing from the spirit of the invention. I, therefore, do not wish to be limited to the precise details of construction set forth, but

Copies of this patent may be obtained for five cents each, by addressing desire to avail myself of such variations and modifications as come within the appended'claim. I

Having described my invention what I claim as new and desire to secure by Letters Patentis:

A device of the class described comprising a shank; a head at one end of said shank; a plurality of radial slots in said head opening at the side and one end of said head; a plurality of cutting elements mounted in said slots having corresponding ends pivotally secured to said head so as to permit of radial swinging of the opposite ends thereof, said last'mentioned ends of said cutting ele ments extending beyond, the corresponding end of said head and having cutting edges at their inner sides; a sleeve shiftablelongitudinally of said head for swinging said cutting elements inwardly; means for shifting said sleeve duringrotation of said shank,

said meanscomprising a member loosely engaging left hand threads provided on said shank; an inwardly, extending flange at one end of. said sleeve engaging a circumferential groove provided in said member whereby said sleeve will be locked to said member in such a manner as to permit of free relative rotary movement of said sleeve; and means for manually arresting rotary move ment of'said member during rotation of said head, substantially as'described.

In testimony whereof I have signed my name to this specification in the presence of two subscrlbing witnesses.

Witnesses: 7

JOSHUAVVR. H. Po'rrs, HELEN F. LrLLIs.

Washington, D. c.

MICHAEL 'J. HEALY. V V

the Commissioner of Patents,

4O the scope of 

